The Insert method creates a new section object and adds it the the collection. To determine the object type at runtime, define the header control's OnCreateSectionClass event handler. If this event handler is not defined, the new section object is an instance of THeaderSection. 

The Index parameter determines the Index property of the panel object. If Index is negative, the panel object is added at the end of the collection. 

Insert returns the new panel object. 

Add 

AddItem